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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9890c9e186756e86c03db2a7025f9ba135ba12f1bdf75529ea0e3b7a50c0ddf' 
  AND token = 'e1YtzlwuddnmH+OtbtX74gjYeh0/gWMNuKP6VORB1ow=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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