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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69b73695002f311e78767f5cda8c56b6de04cb36fd541f2f17343e1adcd31bd9' 
  AND token = 'KveqvEk926+NozilDQ48d5hPaGkxX9lEKn1uVO3X0x8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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