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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df5684e14818c5b3d9d2cef1c39b094becd8f4cfdfc4c25402a37a73e6b90451' 
  AND token = 'v9s5B7DLuMaocEwQydYp9Y55EPjGnVwHKs4bfaDWk4o=' 
  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"
    }
  }
}