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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fe3c1e1ca6f26817557545c86bade4c7d16b977a103ee4db451f48252287078' 
  AND token = 'F7YRlggzskpySO3b4shd/9SRI2TZ0O9xA+Rh6wkLO80=' 
  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"
    }
  }
}