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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd888186fcc48799beffc45d7780075f3cc3197aef895ec7ca0a8892538ec0bea' 
  AND token = '1+CdZK9SuHSbMmTPPMX+8mbNZ1NV8l+sN7lh2URGKaE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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