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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '652362a407fae8c647be87c4f2cd961bca8be7ad9304ea88133b1eb2670c5e69' 
  AND token = 's5HOZBMhcuC7C6QOWyQAGyMDclS9R8/6oTbzFDzndb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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