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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f0e3a5f1aaf83464f55f6e1525fa417ae9ad92ecc5a612a075a624b73018f51a' 
  AND token = 'I2kcMMBPsxeFMEKHkqNkuJjSiLt/24+tJPDSjp+42Fs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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