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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ad2809f627e1e8e995c171ecf34ae30d81b6951429bffcca2f270b84d0e97c4e' 
  AND token = 'mqRWUoVeReG/Ht1edLJJKIUfMkj/UwbiIIY30p9mEdE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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