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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a47e87637592e1808a36fb899c9d27de53d641bde2e116e8559d6771de2a16f' 
  AND token = 'vB7SvDT8t7bEC4i2SqDHTKyZensLT9Ppry328W9oO8w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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