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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b3d331baa4f8ca1ac73848fdc9a2d2a188e56ec05991d6bb960a45498bd2ec' 
  AND token = 'bLE2/E01TL3kn4GKUojuYK+l+9i49rz6+fuk4r75+DU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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