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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f74861aeab10cc595211bc77bf651dfbf9c71d87e3ea28110e933395c0b0c35a' 
  AND token = 'R2+rtgnQBMh0eCnMFEOa/yBp5Bij+BIqte9c9N0BdNs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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