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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ec3ad4ffb2fa75215378f471721c0e897a6f687e4b8b34781c45f333961826' 
  AND token = '2yOBb9rXstQjZDde70lyYfjqP6mxPY6qPgMicBZXHCo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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