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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8ee09c1f13e517a8b11aff224413e14914be3ff67e49e06ce3ab2e77bc04dfd' 
  AND token = 'iBxl7cSsYfz1jI3RU8fVs1Fska8XGpd671H3eDqBchE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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