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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b5af99c0b98ac8265bb78c7365be7046c5b39a7b6d68f7e31807c581d0925bf' 
  AND token = 'JLussE5t1WWHOmeea221XgovN9Q5n2xlxzhIKIhodn0=' 
  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"
    }
  }
}