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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fb622f9c92dd89b6a1d0988c1cd8516fcf48d785a1bfba3ce9ff6bb2f93809' 
  AND token = 'oyrALITDDqe0D0tnFhHa7RL1TUIx44J+4smvT4hnM6I=' 
  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"
    }
  }
}