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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be0d5e135f72817911c58ba0867cc5f97e899e9da3ea85c1c2fec6a982a08448' 
  AND token = 'q47EAb8xzD53X3PF1L6NqhwwzqWjRJZfhc0tW5+mFZo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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