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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '611c0af5e2cb4a096933456926debb56c383873bb784523c419c5d4f05b7a912' 
  AND token = 'ReFGXYVcwf0bB5SPC240Rt0H04beFdcs1Ii3OkoEGUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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