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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aad70e6c7309a831fe656c8beec5d8d34df469ba7ebe578d2407acc99c3a4d70' 
  AND token = '0+nmzYcJIU585eQk3bhbVwVXQ4qFykxBIYzk4t/ZbfA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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