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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c3cc9d15fbdbfd49dc37ed634f44acf8e7b1a1f98e89c71d8284d21c4c352a' 
  AND token = 'ASNOHKu87jC70x50GrHAhwvR/ezXSHE5cKMRr//QPgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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