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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4008621e1af30558cef243998372cb07fbe8b4dbbaac7b7f6c53578f26cceb2b' 
  AND token = '1H2dSnyNjJ39PetwOH+83ORyW+WVdSER1FuCN8ARrEg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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