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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e14593245b9801a5665a7616f0605174899fa91f3b1cf7a53f725271de10d622' 
  AND token = 'sTde8rm9UA/si8QVmS/8pUVEdkvgfisGrfSxZXSyfjg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}