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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7e9f402ba60d123395d06a9d2e08d911c9b2a7c6d6946d51e34095a379ab9545' 
  AND token = 'R8H3wnbHJGjwkww105u3EQ1j8TJyd2QkPuMOna+Rc8s=' 
  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"
    }
  }
}