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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c3dbb98f360a58b04aaf66ff0af748585863a46aa8c3e4d11019497d5356ea' 
  AND token = 'm9gNib/Tvon7gDBM4rlwv1yGWNrIvmI4ScO3apUHobY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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