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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc05378031f4747ad6a798ea7c787d3d0b7e4d536063bfc165a63df07b166bda' 
  AND token = '2Lgroy5ny0BlYZIuJrzsYiM1thckK4r5xqAWcCaPuuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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