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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a824a2a285b69421870d1ce0cf3f2fc1cf69f32e5114369a8edd0323a16b1f37' 
  AND token = '0mkyjgMeZB96zNtFEW2Ln5kUypTQwJth2et23sCwE58=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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