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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c46789c533fb84df52f66420c68b4a2cf9fb3ef7fea205b2e38187375a4aa78b' 
  AND token = 'CxIdTWQ9IknIXE3GDlel7/l0nbGv9F3OS0erllRzctA=' 
  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"
    }
  }
}