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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d51e71d5281930f020c19e8205b493239df744041ca77208a9350c565beafcb' 
  AND token = 'tUX4D/Xz5ijiTV/+E6O1LLJxDXUOV+ISbI2/cd1jGwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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