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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '072c4d652b1c13d7f9760e2c6b271a0e9a4c004b5cc00ca39da8a9a995b41bcb' 
  AND token = '1F6qDeOXn1YH628y1Vz3Je03luqoHIyj3I8qMLhH1c0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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