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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dc2a1e39d87c07f5106ba4c92fc600c61b81d8371ec6ddc10be85a319928e03' 
  AND token = 'a53FOP8w++3nE3htj3bDLHHlz5dBPYnAykNLoQShrTY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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