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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fcac7136fb8d65e51bda4300aafe5ab2ff8f3a485406c6bfad2b2005e83ac08e' 
  AND token = 'URLUelrQBvWSrzqFfUt/GV4QnAcDLRBMhf7qzGqvGhA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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