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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a6e89cc66f186d5233ccc7f9077b7772da7579e32388112a6b5892219e4dd4' 
  AND token = 'mo54Yw5DwiC4RrgwQDYuktJkHmIrYNwbH+ll/1yEqLw=' 
  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"
    }
  }
}