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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e93ca321d45a6c7a6609eb0d72a8f591130351e0857d72ec70e42defa77fc720' 
  AND token = 'TCJbtNk35HF4Ti6bhRlfK79NuAnDBzlCiR7f4af72zM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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