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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f40f5ad0d11eead37542c5377fe82b68c9268634294d7e8f46a230b8bd77d326' 
  AND token = 'R2Zvi9mMP5rEpDxwsEfEQn4LKkbLA4W4u+Kvp21RnqE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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