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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f7826f100c43d82cc204bdb3e0a275946bc5307f2e5965724c424140117e9a29' 
  AND token = 'IR4cxEoFf4e25urqsWeGdZ/3VpzhCQ8zQBnioeaka7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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