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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02d6b5a88952713e4302bb93d91b82146dc2669c6202b791b0cd12968922037f' 
  AND token = '8kr5r+L1nT8hvAqXViLpBX0Ih5zqN4W7drPIxkz4fNo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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