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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e047038c717cbd25166fee10ffecda21443da99335bebf3df8044b6005a8c5e' 
  AND token = 'po0kAxn2TysBRPPxX0ikw7frIp8zWNqCs+AOBsT43yg=' 
  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"
    }
  }
}