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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bc0abc3d3bbb5eec266349713e6af5e2c15afadd3bcdce4c36659cb7275b4bbb' 
  AND token = '7K3x8mf4NezpGi68dtsbN4WgvdvtEJ1mgqS5uKxTfq0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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