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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a0e90ec74583f682e4f12f3856e1c44a428ee12eccf9f3eeed9a2d5cd50e157' 
  AND token = 'mtayYFnSKHcFAlUohSuDLlHz+G6dw5/AfPQ/O3uAFWU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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