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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e840dd779af56d5f24aeb750e5ce8f38ad06a4229e33b38ed6b7902a4c3eaf80' 
  AND token = '1PUUXHSa7TSI3so2vzn0BwEg7bvsm7h1Bl7hP0MkeTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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