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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c026377e24b0e8dbfd6f25ef885e88f9d0fad0e6b7ba546f0bac7dd94c6688cd' 
  AND token = 'eWRv42+DVveI4ypHwy5DB+FHjIGQ0wqaVae28DC8Nt4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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