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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef5dd59313ff10ef0a7635ec3d39986a762825a48c1b316b534119e9b3ab23c0' 
  AND token = 'NOLPivraRTW3MD/ZMAaQ9xlco+1vIp4wn22RFqfREs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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