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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '686568aa05c6a0460f6e652ef638cd694cfe618b7276639cc4540a667c4f8b97' 
  AND token = 'OYnWisq0DMleRyaKAR2uC4yE7cbyRwwZT6FtMNtd4tE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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