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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2d61e95d194d3956e7f1cd8525b270aff5b50381455ef288199f7b9e30c406bd' 
  AND token = 'Xc4OLiH8os8Ct9uymUGF/xjFVkOBFziWEePvYEInpAk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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