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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e617c0e08cdacb903be0968e108acc80ff1fa0e345e367f0a6b2ff72d3110dcb' 
  AND token = 'Rch7NbakYe6b90y6GUnX0pKc867qxvHg5OgugzrgkqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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