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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce4569697e641ca65af1e706cd9b56c8aeead03ebcd06e60f418533df4f3a886' 
  AND token = 'xiGGhnjOl4e8HHK/7VSoODi6HpWsJpLD1H7VEr6nfwM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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