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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b4c05439aa0d76fb8aaeaaaf7524f2f8b4c2fd55c30d2010c683e16755752d35' 
  AND token = 'a4Fh45LRXtU8FeH3fQNODy6kw13AWv+np2rZYSM6cvY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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