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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e2aba220cb58cfc3db0fff53064548f9e8ce46c3a5f0e17fa53c6014194b6e7' 
  AND token = 'MiJVP6Uy6pxAH68izIEWraavYB6+LE3M4ciPEFXCDyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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