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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d26f0d3fdccc03e9135722d8bfe30c22dd35f785c8e3d146d7682302764a97c' 
  AND token = 'RJx37d6OFhR7+GiGFCJpk08o5spOpKC3pPXXqfk4pb8=' 
  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"
    }
  }
}