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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '117242832fe723a725762092efbfbf865a66aa7b9e48f854cd66faea93d0c9f2' 
  AND token = '+3qfto2BMWxWhp7elrD/wCNGc9ILQGNLZ9pd2SOVJuA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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