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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7cbcd316cf38433d35b8b72772a2c89ff9d9a9ece6c77c7a0f61b937f4158a41' 
  AND token = 'ChYesKQwwDachF3w6C7eCEtSVh2S0Ijmao/Pn7scnwk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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